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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets | Goodwill and Other Intangible Assets (In Thousands) Changes in the carrying amount of goodwill during the years ended December 31, 2018 and 2017 were as follows:
| Community Banks |  | Insurance |  | Total
Balance at December 31, 2016 | $ | 467,767 |  |  | $ | 2,767 |  |  | $ | 470,534 |
Addition to goodwill from Metropolitan acquisition | 140,512 |  |  | — |  |  | 140,512 |
Balance at December 31, 2017 | $ | 608,279 |  |  | $ | 2,767 |  |  | $ | 611,046 |
Addition to goodwill from Brand acquisition | 321,882 |  |  | — |  |  | 321,882 |
Balance at December 31, 2018 | $ | 930,161 |  |  | $ | 2,767 |  |  | $ | 932,928 |
The additions to goodwill in 2018 from the Brand acquisition and in 2017 from the Metropolitan acquisition represent the excess of the purchase price over the fair value of assets acquired and liabilities assumed in the relevant transaction. The Company is in the process of completing Brand's final tax return and finalizing the fair values of loans and property and equipment related to the Brand acquisition; as a result, the recorded balance of goodwill attributable to the Brand acquisition is subject to change in future periods. The following table provides a summary of finite-lived intangible assets as of the dates presented:
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
December 31, 2018 |  |  |  |  |
Core deposit intangible | $ | 82,492 |  |  | $ | (38,634 | ) |  | $ | 43,858 |
Customer relationship intangible | 1,970 |  |  | (963 | ) |  | 1,007 |
Total finite-lived intangible assets | $ | 84,462 |  |  | $ | (39,597 | ) |  | $ | 44,865 |
December 31, 2017 |  |  |  |  |
Core deposit intangible | $ | 54,958 |  |  | $ | (31,586 | ) |  | $ | 23,372 |
Customer relationship intangible | 1,970 |  |  | (832 | ) |  | 1,138 |
Total finite-lived intangible assets | $ | 56,928 |  |  | $ | (32,418 | ) |  | $ | 24,510 |
Core deposit intangible amortization expense for the years ended December 31, 2018, 2017 and 2016 was $7,048, $6,399 and $6,616, respectively. Customer relationship intangible amortization expense for the years ended December 31, 2018, 2017 and 2016 was $131 each year. The estimated amortization expense of finite-lived intangible assets for the five succeeding fiscal years is summarized as follows:
| Core Deposit Intangibles |  | Customer Relationship Intangible |  | Total
2019 | $ | 7,965 |  |  | $ | 131 |  |  | $ | 8,096 |
2020 | 6,939 |  |  | 131 |  |  | 7,070 |
2021 | 5,860 |  |  | 131 |  |  | 5,991 |
2022 | 4,940 |  |  | 131 |  |  | 5,071 |
2023 | 4,044 |  |  | 131 |  |  | 4,175 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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